doble



A. DOBLE.

COMBUSTION HEARTH.

APPLICATION man JAN.5.1917.

Patented Aug. 19, 1919.

2 SHEETS-SHEET l.

A. DOBLE.

COMBUSTION HEARTH. APPLICATION FILED JAN. 5. 1917.

1,313,526. Patnted Aug. 19, 1919.

` I ZvSHEETS-SHEET 2- j unrran sfra'rns PATENT carica.

ABNER DOBLE, 0]?` DETROIT, MICHIGAN, ASSIG-NOR, BY MESNE ASSIGNMENTS, TO

DOBLE-DETROIT STEAM MOTORS C0., 0F DETROIT, MICHIGAN, A CORPORA.-

TION 0F DELAWARE.

Lai-3,526.

rwdenisrisasoir-nanars;

Specification 0 1 `Jfetters'flatent. Patented Aug'. 19., 1919. .I

Application med January 5, 1917. Serial Nc. 140,730.

To all whom it may concern.'

Be Eit known `thatfI, ABNnR DOBLE, a citi- 4N"/zeio'f"thewnited States of America, and

more particularly my .invention is directed to an improved combustion hearth especially adapted for use in connection with an apparatus for .the consumption or combustion of liquid or gaseous fuels.

,My object is to make an improved combustion hearth of this character which will be simple, durable and reliable i n construction, and eifective and eiiicient in o eration. Other objects of my `invention wi l appear hereinafter.

Referring to the accompanying drawings,

I illustrate various forms of combustion hearths which embody my invention.

In the drawings:

Figure 1 is a view in perspective looking into tlie interior of my improved combustion hearth or burner member.

Fig. 2 is a vertical section through the structure shown in Fig. 1.

Fig. 3 is a section similar to Fig. 2 of a mod il'ication. Fig. 4 is another section similar to Fi 2 vexcept thatthe interior` thereof is` modi ed. 1

Fig.' 5 is a plan'view of still another modified structure.

Fig. 6 is a section substantially on the line 6-6 of 5. y In the various methods and apparatuses heretofore proposed or used for the combustion of liquid gaseous fuels it has-beenthe practice generally to provide a burner plate or member having -a plurality of perforations or openings through `which' the fuelis passed from "one Side of the burner to the other in gaseous form, the fuel however having been previously mixed with the proper amount of air to form a combustible mixture, thecombustion of the fuel mixture taking" place' on the side ofthe plate opposite ployed as the energizing forceand liquid fuel, such as kerosene, sed as the source of heat in the generation of the steam.. Inthis l catalytically to accelerate and sustain an inwhich is" capable of becoming incandescent v case `the liquid fuel is of necessity rst vaporizfed oriconverted into a gas before being mixed with air and passed through the burnerto the combusti-on side thereof. The

necessity of passing the fuel mixture throu h prevapolfzationmechanism; I urn the fuel mixture in the presence of and in intimate relation to a combustion member which acts tense and complete combustion of the fuel, and itiis in connection with this combustion member or hearth that my present invention is concerned. In carrying out my system or method heretofore mentioned, of burning fuel I direct the fuel, 4properly mixed with air, and in 'either a vaporized or an atomizedj or finely divided state, upon or against'the surface of the combustion hearth 1n such manner that the combustion of the fuel is 80 concentrated u on or in'intimate relation to the hearth sur ace and in a zone adjacent this surface andthe combustion of the fuel in this manner operates to renderthe combustion hearth, or at least its interior surface, incandescent. The intense zone of heat created by the burning of the fuel, and the incandescent state of said hearth in turn accelerates and sustains the combustion of the incoming fuel. However, in the drawin I l have indicated generally aV tubular mem er v A by or through which the Yfuel mixture isk introduced to the combustion'z'one, but thisneeds no particular description except to say]Y that it is arranged or disposed of in suc manner with respect to the hearth that it directs the fuel upon said hearth on the same side thereof on which combustion takes place.` This combustion hearth B mustvbe made of highly refractory material which is capable of withstanding intense heat wlthout disintegration, cracking or distortion, and

under the influence of this intense f heat. This combustion` hearth is made generally in the shape of a bowl or dish openat its top, `and in the drawings 'it' is shownsubstantially rectangular, although circular or of any other desira le shapede-f pending upon its particular place ofuse. It

it may-ba has side walls 10 and a bottom wall 11, the

bottom wall being substantially flat and the side wall being disposed generally at right angles thereto, and all of the walls are of practicallythe same thickness.' The thickness of the walls is preferably suiicient to prevent the heat or at"least-a-material rde gree thereof from penetrating to the exterior of the hearth and for this reason I use a material which is not only highly refrac tory but also a minimum of heat conductivity. In the several structures shown in the drawings the corners and angles -15 between the side walls and bottom walls are rounded olf or curved so as-to properly direct the burning gases and keepsthem circulating 'in which have the effect of retarding'- Vt e flowl of fuel gases and retaining them for a longer make the structure extremely porous or absorbent so that in the event that any fuel should reach thev hearth, especiallygimstagting the process of combustion in. liquid forrrn'wv it will be instantly soaked up or absorbed by the hearth and then gradually vaporized and released and consumed, the combustion being-complete and effectively preventing smoking. A very effective and practicable the combustion hearth through a suitable period of time within the combustion zone.

The interior of the hearth may be arranged in this manner by forming innumerable pro-- jections or irregularities 16 integrally with the hearth itself as indicated in Figb. l'and 2, or by strewing particles or irregular shaped lumps 17 of refracto material upon the interior surface2of the earth, as' indicated in Fig.v 3, and securing these in place by Welding or otherwise fastening them to the hearth. However,it is not necessary that these particles be secured in lace, but in such case it would of course on y be possible tonrjetain them upon the bottom wall. I also ind it eminently practicable to provide well defined passages or within 'the combustlon chamber securing in place a number of substantial y regular blocks or bricks 19 of' refractory material such as indicated in Fi 4. These are preferably of the same re actory material as the hearth itself and are preferably secured in place by welding or fusingjthem to'each other and to the hearth. Thus the effective incandescent area is increased by the area of these blocks. f

In manufacturing my improved hearth I preferably mix the refractory material with water or other suitable liquid to make a plastic product and then mold or formthis plastic material into the desired shape. The molded form is then baked or heated until the water is completely removed, having a y hard, tough structure. I nd it desirable to member.

ottoes 18 opening in one of the side walls thereof. The fuel is thus directed generally toward the side Wall opposite to the fuel tube or nozzle and along and in intimate relation to the interior surface. The burning fuel, however, is deflected by the curvature of the corners and angles and thus circulated within the entire chamber and along the other I side walls. In order, however, to prevent the llame from being diverted upwardly I provide an arch 20 which as shown overlies the central portion of the chamber above the stream of fuel emitted from the tubular This arch is shown as being formed integrally with the rest of the structure but of course it maybe made as a separate piece fitted in place if desired.

I claim: v

1. A combustion hearth comprising a member havingbottom and side Walls Aand open at its top and composed of porous refractory material and capable of being heated to incandescence, and having its interior roughened or irregular to provide an increased exposed surface area.

2. A combustion hearth of the class de- ABNER DOBLE.

Witnesses z E. H. CLEGG, AMY Janna 

